In this answer, it is stated that applying post-selection to quantum teleportation results in Alice communicating to Bob backwards in time. Could someone explain how this works?
I am particularly confused by how Alice decides what to post-select on. For example, if she wanted to teleport $$\newcommand{\ket}[1]{\lvert #1\rangle}\ket{-} = \frac{1}{\sqrt{2}}(\ket{0}-\ket{1})$$ then she could not post select on $\ket{00}$ because the amplitude of this state in the first two qubits would be zero.
So, it seems like what state she post-selects on depends on what state she wants to teleport. This means she needs to tell Bob what state she is going to post-select on after deciding what state to send him. This seems equivalent to sending him the two classical bits in the usual quantum teleportation.
What am I missing here?